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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Bug with the following test and description as well:
Input: 1254859723 Output: 9875543221
9875543221 is out of range for type Int